<template>
  <div class="component-upload-video">
    <el-upload
      multiple
      :disabled="disabled"
      :action="uploadVideoUrl"
      list-type="text"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :data="data"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="videoUpload"
      :before-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handleVideoPreview"
      :class="{ hide: fileList.length >= limit }"
      accept="video/*"
    >
      <el-button type="primary">
        <el-icon><upload-filled /></el-icon>
        上传视频
      </el-button>
    </el-upload>
    
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip && !disabled">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的视频文件
    </div>

    <!-- 视频预览 -->
    <div class="video-preview" v-if="fileList.length > 0">
      <div v-for="(file, index) in fileList" :key="index" class="video-item">
        <video 
          :src="file.url" 
          controls 
          style="width: 200px; height: 150px;"
          preload="metadata"
        ></video>
        <div class="video-info">
          <span class="video-name">{{ file.name }}</span>
          <el-button 
            type="danger" 
            size="small" 
            @click="removeVideo(index)"
            :disabled="disabled"
          >
            删除
          </el-button>
        </div>
      </div>
    </div>

    <!-- 视频预览对话框 -->
    <el-dialog
      v-model="dialogVisible"
      title="视频预览"
      width="800px"
      append-to-body
    >
      <video
        :src="dialogVideoUrl"
        controls
        style="width: 100%; max-height: 400px;"
        preload="metadata"
      ></video>
    </el-dialog>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth"
import { ref, computed, watch, nextTick, getCurrentInstance } from 'vue'
import { UploadFilled } from '@element-plus/icons-vue'

const props = defineProps({
  modelValue: [String, Object, Array],
  // 上传接口地址
  action: {
    type: String,
    default: "/file/upload"
  },
  // 上传携带的参数
  data: {
    type: Object
  },
  // 视频数量限制
  limit: {
    type: Number,
    default: 5
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 100
  },
  // 文件类型, 例如['mp4', 'avi', 'mov']
  fileType: {
    type: Array,
    default: () => ["mp4", "avi", "mov", "wmv", "flv", "webm"]
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  // 禁用组件（仅查看视频）
  disabled: {
    type: Boolean,
    default: false
  }
})

const { proxy } = getCurrentInstance()
const emit = defineEmits(['update:modelValue'])
const number = ref(0)
const uploadList = ref([])
const dialogVideoUrl = ref("")
const dialogVisible = ref(false)
const baseUrl = import.meta.env.VITE_APP_BASE_API
const uploadVideoUrl = ref(baseUrl + props.action) // 上传的视频服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() })
const fileList = ref([])
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize)
)

watch(() => props.modelValue, val => {
  if (val) {
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : val.split(",")
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      if (typeof item === "string") {
        item = { name: item, url: item }
      }
      return item
    })
  } else {
    fileList.value = []
    return []
  }
},{ deep: true, immediate: true })

// 上传前loading加载
function handleBeforeUpload(file) {
  let isVideo = false
  if (props.fileType.length) {
    let fileExtension = ""
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1)
    }
    isVideo = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true
      if (fileExtension && fileExtension.indexOf(type) > -1) return true
      return false
    })
  } else {
    isVideo = file.type.indexOf("video") > -1
  }
  if (!isVideo) {
    proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join("/")}视频格式文件!`)
    return false
  }
  if (file.name.includes(',')) {
    proxy.$modal.msgError('文件名不正确，不能包含英文逗号!')
    return false
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      proxy.$modal.msgError(`上传视频大小不能超过 ${props.fileSize} MB!`)
      return false
    }
  }
  proxy.$modal.loading("正在上传视频，请稍候...")
  number.value++
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`)
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code === 200) {
    uploadList.value.push({ name: res.data.url, url: res.data.url })
    uploadedSuccessfully()
  } else {
    number.value--
    proxy.$modal.closeLoading()
    proxy.$modal.msgError(res.msg)
    proxy.$refs.videoUpload.handleRemove(file)
    uploadedSuccessfully()
  }
}

// 删除视频
function handleDelete(file) {
  const findex = fileList.value.map(f => f.name).indexOf(file.name)
  if (findex > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(findex, 1)
    emit("update:modelValue", listToString(fileList.value))
    return false
  }
}

// 手动删除视频
function removeVideo(index) {
  fileList.value.splice(index, 1)
  emit("update:modelValue", listToString(fileList.value))
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value)
    uploadList.value = []
    number.value = 0
    emit("update:modelValue", listToString(fileList.value))
    proxy.$modal.closeLoading()
  }
}

// 上传失败
function handleUploadError() {
  proxy.$modal.msgError("上传视频失败")
  proxy.$modal.closeLoading()
}

// 预览
function handleVideoPreview(file) {
  dialogVideoUrl.value = file.url
  dialogVisible.value = true
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = ""
  separator = separator || ","
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url.replace(baseUrl, "") + separator
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : ""
}
</script>

<style scoped lang="scss">
.component-upload-video {
  .video-preview {
    margin-top: 20px;
    
    .video-item {
      display: inline-block;
      margin-right: 20px;
      margin-bottom: 20px;
      text-align: center;
      
      .video-info {
        margin-top: 10px;
        
        .video-name {
          display: block;
          margin-bottom: 5px;
          font-size: 12px;
          color: #606266;
          max-width: 200px;
          overflow: hidden;
          text-overflow: ellipsis;
          white-space: nowrap;
        }
      }
    }
  }
}

// .el-upload--text 控制上传按钮部分
:deep(.hide .el-upload--text) {
    display: none;
}

:deep(.el-upload.el-upload--text.is-disabled) {
  display: none !important;
}
</style> 